I’m sure it’s possible on Windows, but you will be limited to static analysis.
You are likely better off just doing it in *nix.
I will offer a couple hints, though:
This is a crackme, so you are looking for a binary executable.
The first hint is a command that will give you the next layer of steganography.
The second hint doesn’t come into play until you have an actual ELF file you can execute and examine.
Also, if anybody else had trouble extracting and converting a certain part of a certain file during the stego part of the challenge, here’s my (bad) solution (this is a much more spoilery hint!):
I installed Jeex, a hex editor, then viewed the second image in ASCII and copied it to a text file.
Then, I trimmed all the whitespace and the single character that isn’t part of that alphabet’s encoding and was able to decode it.
I wasn’t able to do this from the terminal, so if one of you wizards would like to pm me their one-liners for this part of the extraction, that would be awesome.